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Finding the Fourth Proportional to 929.34, 1,393.89 and 539.55

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Solution

The fourth proportional to 929.34, 1,393.89 and 539.55 is: 809.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.34 : 1,393.89 = 539.55 : x
  2. Step 2: Convert to fraction form
    929.34/1,393.89 = 539.55/x
  3. Step 3: Cross multiply
    929.34x = 1,393.89 × 539.55
  4. Step 4: Simplify right side
    929.34x = 752,068.52
  5. Step 5: Solve for x
    x = 752,068.52/929.34
  6. Step 6: Final answer
    x = 809.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.